If you've seen pictures before of it, that's because they're false colour or composite images. Because it's all rock and dust on the surface, and none of that rock or dust reflects strongly in any visible spectrum peak, it just looks grey

Originally Posted by tuanming;12928203
In time like this, it's best to ask professor Michio Kaku (the dude knows pretty much everything) I'd pay him to lecture my courses...

Well he's actually a theoretical physicist. Although he can explain in great detail about quantum gravity, but questions regarding Mercury and other planets may be better reserved for astrophysicists or astronomers (NOT astrologers).

It's like asking Wayne Gretzky to teach you how to perform a jersey pull... Yeah, he knows the basics, he's witnessed them, but I'd rather ask Tie Domi.

Yeah. Whats dead is dead. What's grey is grey. Our moon and mars fit both descriptions. Mars may seem red but no, it isn't. Now I'm thinking its a possibly picture of the surface of mars' polar ice caps.